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a. An awareness of morality in regard to one's behavior; a sense of right and wrong that urges one to act morally: Let your conscience be your guide.
b. A source of moral or ethical judgment or pronouncement: a document that serves as the nation's conscience.
c. Conformity to one's own sense of right conduct: a person of unflagging conscience.
2. The part of the superego in psychoanalysis that judges the ethical nature of one's actions and thoughts and then transmits such determinations to the ego for consideration.
3. Obsolete Consciousness or awareness of something.
in (all good) conscience
In all fairness; by any reasonable standard.
on (one's) conscience
Causing one to feel guilty or uneasy.

[Middle English, from Old French, from Latin cōnscientia, from cōnsciēns, cōnscient-, present participle of cōnscīre, to be conscious of : com-, intensive pref.; see com- + scīre, to know; see skei- in Indo-European roots.]

con′science·less adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.conscienceless - lacking a conscienceconscienceless - lacking a conscience; "a conscienceless villain"; "brash, unprincipled, and conscienceless"; "an unconscionable liar"
unconscientious - not conscientious;


Lacking scruples or principles:
References in classic literature ?
He is a subtle, conscienceless Italian, who though he very likely dreams of crime, dares not commit it; and unlike Cromwell, who disposes of both Houses, Mazarin has had the queen to support him in his struggle with the parliament.
The ocean has the conscienceless temper of a savage autocrat spoiled by much adulation.
No one but a nation of pirates, of ferocious and conscienceless huns, could have inaugurated such a campaign.
How far she developed and illustrated that conscienceless and austere doctrine to the girl- friends, who were mere transient shadows to her husband, I could not tell.
even battered, brazen, beautiful, conscienceless, heartless, Mrs.
Have these utterly conscienceless MPs learned nothing over the past 10 years?
Another said: "Massively ashamed to be represented in parliament by the apparently conscienceless p***k.
One user sent him an image of dead children, while another said: "Massively ashamed to be represented in parliament by the apparently conscienceless p***k.
He claimed that at times these drugs were also black marketed by some conscienceless people exploiting the requirement of the patients.
In fact, Simon turns out to be precisely one of those conscienceless bullies, a kid who ran for high-school class president on the slogan "Simon Sez".
This is precisely the kind of empowerment that must be denied to these conscienceless people and everyone who is guilty of helping this video go viral needs to consider this grim truth.
Unfortunately, along comes the occasional conscienceless troller, dragging long wire lines smack in the middle of the vertical jiggers.